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[Samba.git] / lib / krb5 / pkinit.c
blob1f6c3d480603bdc82b43ab77734c0d90f8844ddb
1 /*
2 * Copyright (c) 2003 - 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "krb5_locl.h"
35
36 struct krb5_dh_moduli {
37 char *name;
38 unsigned long bits;
39 heim_integer p;
40 heim_integer g;
41 heim_integer q;
42 };
43
44 #ifdef PKINIT
45
46 #include <cms_asn1.h>
47 #include <pkcs8_asn1.h>
48 #include <pkcs9_asn1.h>
49 #include <pkcs12_asn1.h>
50 #include <pkinit_asn1.h>
51 #include <asn1_err.h>
52
53 #include <der.h>
54
55 struct krb5_pk_cert {
56 hx509_cert cert;
57 };
58
59 struct krb5_pk_init_ctx_data {
60 struct krb5_pk_identity *id;
61 enum { USE_RSA, USE_DH, USE_ECDH } keyex;
62 union {
63 DH *dh;
64 #ifdef HAVE_OPENSSL
65 EC_KEY *eckey;
66 #endif
67 } u;
68 krb5_data *clientDHNonce;
69 struct krb5_dh_moduli **m;
70 hx509_peer_info peer;
71 enum krb5_pk_type type;
72 unsigned int require_binding:1;
73 unsigned int require_eku:1;
74 unsigned int require_krbtgt_otherName:1;
75 unsigned int require_hostname_match:1;
76 unsigned int trustedCertifiers:1;
77 };
78
79 static void
80 pk_copy_error(krb5_context context,
81 hx509_context hx509ctx,
82 int hxret,
83 const char *fmt,
84 ...)
85 __attribute__ ((format (printf, 4, 5)));
86
87 /*
88 *
89 */
90
91 void KRB5_LIB_FUNCTION
92 _krb5_pk_cert_free(struct krb5_pk_cert *cert)
93 {
94 if (cert->cert) {
95 hx509_cert_free(cert->cert);
96 }
97 free(cert);
98 }
99
100 static krb5_error_code
101 BN_to_integer(krb5_context context, BIGNUM *bn, heim_integer *integer)
102 {
103 integer->length = BN_num_bytes(bn);
104 integer->data = malloc(integer->length);
105 if (integer->data == NULL) {
106 krb5_clear_error_message(context);
107 return ENOMEM;
108 }
109 BN_bn2bin(bn, integer->data);
110 integer->negative = BN_is_negative(bn);
111 return 0;
112 }
113
114 static BIGNUM *
115 integer_to_BN(krb5_context context, const char *field, const heim_integer *f)
116 {
117 BIGNUM *bn;
118
119 bn = BN_bin2bn((const unsigned char *)f->data, f->length, NULL);
120 if (bn == NULL) {
121 krb5_set_error_message(context, ENOMEM,
122 N_("PKINIT: parsing BN failed %s", ""), field);
123 return NULL;
124 }
125 BN_set_negative(bn, f->negative);
126 return bn;
127 }
128
129 static krb5_error_code
130 select_dh_group(krb5_context context, DH *dh, unsigned long bits,
131 struct krb5_dh_moduli **moduli)
132 {
133 const struct krb5_dh_moduli *m;
134
135 if (bits == 0) {
136 m = moduli[1]; /* XXX */
137 if (m == NULL)
138 m = moduli[0]; /* XXX */
139 } else {
140 int i;
141 for (i = 0; moduli[i] != NULL; i++) {
142 if (bits < moduli[i]->bits)
143 break;
144 }
145 if (moduli[i] == NULL) {
146 krb5_set_error_message(context, EINVAL,
147 N_("Did not find a DH group parameter "
148 "matching requirement of %lu bits", ""),
149 bits);
150 return EINVAL;
151 }
152 m = moduli[i];
153 }
154
155 dh->p = integer_to_BN(context, "p", &m->p);
156 if (dh->p == NULL)
157 return ENOMEM;
158 dh->g = integer_to_BN(context, "g", &m->g);
159 if (dh->g == NULL)
160 return ENOMEM;
161 dh->q = integer_to_BN(context, "q", &m->q);
162 if (dh->q == NULL)
163 return ENOMEM;
164
165 return 0;
166 }
167
168 struct certfind {
169 const char *type;
170 const heim_oid *oid;
171 };
172
173 /*
174 * Try searchin the key by to use by first looking for for PK-INIT
175 * EKU, then the Microsoft smart card EKU and last, no special EKU at all.
176 */
177
178 static krb5_error_code
179 find_cert(krb5_context context, struct krb5_pk_identity *id,
180 hx509_query *q, hx509_cert *cert)
181 {
182 struct certfind cf[3] = {
183 { "PKINIT EKU" },
184 { "MS EKU" },
185 { "any (or no)" }
186 };
187 int i, ret;
188
189 cf[0].oid = oid_id_pkekuoid();
190 cf[1].oid = oid_id_pkinit_ms_eku();
191 cf[2].oid = NULL;
192
193 for (i = 0; i < sizeof(cf)/sizeof(cf[0]); i++) {
194 ret = hx509_query_match_eku(q, cf[i].oid);
195 if (ret) {
196 pk_copy_error(context, id->hx509ctx, ret,
197 "Failed setting %s OID", cf[i].type);
198 return ret;
199 }
200
201 ret = hx509_certs_find(id->hx509ctx, id->certs, q, cert);
202 if (ret == 0)
203 break;
204 pk_copy_error(context, id->hx509ctx, ret,
205 "Failed finding certificate with %s OID", cf[i].type);
206 }
207 return ret;
208 }
209
210
211 static krb5_error_code
212 create_signature(krb5_context context,
213 const heim_oid *eContentType,
214 krb5_data *eContent,
215 struct krb5_pk_identity *id,
216 hx509_peer_info peer,
217 krb5_data *sd_data)
218 {
219 int ret, flags = 0;
220
221 if (id->cert == NULL)
222 flags |= HX509_CMS_SIGNATURE_NO_SIGNER;
223
224 ret = hx509_cms_create_signed_1(id->hx509ctx,
225 flags,
226 eContentType,
227 eContent->data,
228 eContent->length,
229 NULL,
230 id->cert,
231 peer,
232 NULL,
233 id->certs,
234 sd_data);
235 if (ret) {
236 pk_copy_error(context, id->hx509ctx, ret,
237 "Create CMS signedData");
238 return ret;
239 }
240
241 return 0;
242 }
243
244 static int
245 cert2epi(hx509_context context, void *ctx, hx509_cert c)
246 {
247 ExternalPrincipalIdentifiers *ids = ctx;
248 ExternalPrincipalIdentifier id;
249 hx509_name subject = NULL;
250 void *p;
251 int ret;
252
253 if (ids->len > 10)
254 return 0;
255
256 memset(&id, 0, sizeof(id));
257
258 ret = hx509_cert_get_subject(c, &subject);
259 if (ret)
260 return ret;
261
262 if (hx509_name_is_null_p(subject) != 0) {
263
264 id.subjectName = calloc(1, sizeof(*id.subjectName));
265 if (id.subjectName == NULL) {
266 hx509_name_free(&subject);
267 free_ExternalPrincipalIdentifier(&id);
268 return ENOMEM;
269 }
270
271 ret = hx509_name_binary(subject, id.subjectName);
272 if (ret) {
273 hx509_name_free(&subject);
274 free_ExternalPrincipalIdentifier(&id);
275 return ret;
276 }
277 }
278 hx509_name_free(&subject);
279
280
281 id.issuerAndSerialNumber = calloc(1, sizeof(*id.issuerAndSerialNumber));
282 if (id.issuerAndSerialNumber == NULL) {
283 free_ExternalPrincipalIdentifier(&id);
284 return ENOMEM;
285 }
286
287 {
288 IssuerAndSerialNumber iasn;
289 hx509_name issuer;
290 size_t size;
291
292 memset(&iasn, 0, sizeof(iasn));
293
294 ret = hx509_cert_get_issuer(c, &issuer);
295 if (ret) {
296 free_ExternalPrincipalIdentifier(&id);
297 return ret;
298 }
299
300 ret = hx509_name_to_Name(issuer, &iasn.issuer);
301 hx509_name_free(&issuer);
302 if (ret) {
303 free_ExternalPrincipalIdentifier(&id);
304 return ret;
305 }
306
307 ret = hx509_cert_get_serialnumber(c, &iasn.serialNumber);
308 if (ret) {
309 free_IssuerAndSerialNumber(&iasn);
310 free_ExternalPrincipalIdentifier(&id);
311 return ret;
312 }
313
314 ASN1_MALLOC_ENCODE(IssuerAndSerialNumber,
315 id.issuerAndSerialNumber->data,
316 id.issuerAndSerialNumber->length,
317 &iasn, &size, ret);
318 free_IssuerAndSerialNumber(&iasn);
319 if (ret)
320 return ret;
321 if (id.issuerAndSerialNumber->length != size)
322 abort();
323 }
324
325 id.subjectKeyIdentifier = NULL;
326
327 p = realloc(ids->val, sizeof(ids->val[0]) * (ids->len + 1));
328 if (p == NULL) {
329 free_ExternalPrincipalIdentifier(&id);
330 return ENOMEM;
331 }
332
333 ids->val = p;
334 ids->val[ids->len] = id;
335 ids->len++;
336
337 return 0;
338 }
339
340 static krb5_error_code
341 build_edi(krb5_context context,
342 hx509_context hx509ctx,
343 hx509_certs certs,
344 ExternalPrincipalIdentifiers *ids)
345 {
346 return hx509_certs_iter(hx509ctx, certs, cert2epi, ids);
347 }
348
349 static krb5_error_code
350 build_auth_pack(krb5_context context,
351 unsigned nonce,
352 krb5_pk_init_ctx ctx,
353 const KDC_REQ_BODY *body,
354 AuthPack *a)
355 {
356 size_t buf_size, len;
357 krb5_error_code ret;
358 void *buf;
359 krb5_timestamp sec;
360 int32_t usec;
361 Checksum checksum;
362
363 krb5_clear_error_message(context);
364
365 memset(&checksum, 0, sizeof(checksum));
366
367 krb5_us_timeofday(context, &sec, &usec);
368 a->pkAuthenticator.ctime = sec;
369 a->pkAuthenticator.nonce = nonce;
370
371 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
372 if (ret)
373 return ret;
374 if (buf_size != len)
375 krb5_abortx(context, "internal error in ASN.1 encoder");
376
377 ret = krb5_create_checksum(context,
378 NULL,
379 0,
380 CKSUMTYPE_SHA1,
381 buf,
382 len,
383 &checksum);
384 free(buf);
385 if (ret)
386 return ret;
387
388 ALLOC(a->pkAuthenticator.paChecksum, 1);
389 if (a->pkAuthenticator.paChecksum == NULL) {
390 krb5_set_error_message(context, ENOMEM,
391 N_("malloc: out of memory", ""));
392 return ENOMEM;
393 }
394
395 ret = krb5_data_copy(a->pkAuthenticator.paChecksum,
396 checksum.checksum.data, checksum.checksum.length);
397 free_Checksum(&checksum);
398 if (ret)
399 return ret;
400
401 if (ctx->keyex == USE_DH || ctx->keyex == USE_ECDH) {
402 const char *moduli_file;
403 unsigned long dh_min_bits;
404 krb5_data dhbuf;
405 size_t size;
406
407 krb5_data_zero(&dhbuf);
408
409
410
411 moduli_file = krb5_config_get_string(context, NULL,
412 "libdefaults",
413 "moduli",
414 NULL);
415
416 dh_min_bits =
417 krb5_config_get_int_default(context, NULL, 0,
418 "libdefaults",
419 "pkinit_dh_min_bits",
420 NULL);
421
422 ret = _krb5_parse_moduli(context, moduli_file, &ctx->m);
423 if (ret)
424 return ret;
425
426 ctx->u.dh = DH_new();
427 if (ctx->u.dh == NULL) {
428 krb5_set_error_message(context, ENOMEM,
429 N_("malloc: out of memory", ""));
430 return ENOMEM;
431 }
432
433 ret = select_dh_group(context, ctx->u.dh, dh_min_bits, ctx->m);
434 if (ret)
435 return ret;
436
437 if (DH_generate_key(ctx->u.dh) != 1) {
438 krb5_set_error_message(context, ENOMEM,
439 N_("pkinit: failed to generate DH key", ""));
440 return ENOMEM;
441 }
442
443
444 if (1 /* support_cached_dh */) {
445 ALLOC(a->clientDHNonce, 1);
446 if (a->clientDHNonce == NULL) {
447 krb5_clear_error_message(context);
448 return ENOMEM;
449 }
450 ret = krb5_data_alloc(a->clientDHNonce, 40);
451 if (a->clientDHNonce == NULL) {
452 krb5_clear_error_message(context);
453 return ret;
454 }
455 RAND_bytes(a->clientDHNonce->data, a->clientDHNonce->length);
456 ret = krb5_copy_data(context, a->clientDHNonce,
457 &ctx->clientDHNonce);
458 if (ret)
459 return ret;
460 }
461
462 ALLOC(a->clientPublicValue, 1);
463 if (a->clientPublicValue == NULL)
464 return ENOMEM;
465
466 if (ctx->keyex == USE_DH) {
467 DH *dh = ctx->u.dh;
468 DomainParameters dp;
469 heim_integer dh_pub_key;
470
471 ret = der_copy_oid(oid_id_dhpublicnumber(),
472 &a->clientPublicValue->algorithm.algorithm);
473 if (ret)
474 return ret;
475
476 memset(&dp, 0, sizeof(dp));
477
478 ret = BN_to_integer(context, dh->p, &dp.p);
479 if (ret) {
480 free_DomainParameters(&dp);
481 return ret;
482 }
483 ret = BN_to_integer(context, dh->g, &dp.g);
484 if (ret) {
485 free_DomainParameters(&dp);
486 return ret;
487 }
488 ret = BN_to_integer(context, dh->q, &dp.q);
489 if (ret) {
490 free_DomainParameters(&dp);
491 return ret;
492 }
493 dp.j = NULL;
494 dp.validationParms = NULL;
495
496 a->clientPublicValue->algorithm.parameters =
497 malloc(sizeof(*a->clientPublicValue->algorithm.parameters));
498 if (a->clientPublicValue->algorithm.parameters == NULL) {
499 free_DomainParameters(&dp);
500 return ret;
501 }
502
503 ASN1_MALLOC_ENCODE(DomainParameters,
504 a->clientPublicValue->algorithm.parameters->data,
505 a->clientPublicValue->algorithm.parameters->length,
506 &dp, &size, ret);
507 free_DomainParameters(&dp);
508 if (ret)
509 return ret;
510 if (size != a->clientPublicValue->algorithm.parameters->length)
511 krb5_abortx(context, "Internal ASN1 encoder error");
512
513 ret = BN_to_integer(context, dh->pub_key, &dh_pub_key);
514 if (ret)
515 return ret;
516
517 ASN1_MALLOC_ENCODE(DHPublicKey, dhbuf.data, dhbuf.length,
518 &dh_pub_key, &size, ret);
519 der_free_heim_integer(&dh_pub_key);
520 if (ret)
521 return ret;
522 if (size != dhbuf.length)
523 krb5_abortx(context, "asn1 internal error");
524 } else if (ctx->keyex == USE_ECDH) {
525 #ifdef HAVE_OPENSSL
526 ECParameters ecp;
527 unsigned char *p;
528 int len;
529
530 /* copy in public key, XXX find the best curve that the server support or use the clients curve if possible */
531
532 ecp.element = choice_ECParameters_namedCurve;
533 ret = der_copy_oid(&asn1_oid_id_ec_group_secp256r1,
534 &ecp.u.namedCurve);
535 if (ret)
536 return ret;
537
538 ALLOC(a->clientPublicValue->algorithm.parameters, 1);
539 if (a->clientPublicValue->algorithm.parameters == NULL) {
540 free_ECParameters(&ecp);
541 return ENOMEM;
542 }
543 ASN1_MALLOC_ENCODE(ECParameters, p, len, &ecp, &size, ret);
544 free_ECParameters(&ecp);
545 if (ret)
546 return ret;
547 if (size != len)
548 krb5_abortx(context, "asn1 internal error");
549
550 a->clientPublicValue->algorithm.parameters->data = p;
551 a->clientPublicValue->algorithm.parameters->length = size;
552
553 /* copy in public key */
554
555 ret = der_copy_oid(&asn1_oid_id_ecPublicKey,
556 &a->clientPublicValue->algorithm.algorithm);
557 if (ret)
558 return ret;
559
560 ctx->u.eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
561 if (ctx->u.eckey == NULL)
562 return ENOMEM;
563
564 ret = EC_KEY_generate_key(ctx->u.eckey);
565 if (ret != 1)
566 return EINVAL;
567
568 /* encode onto dhkey */
569
570 len = i2o_ECPublicKey(ctx->u.eckey, NULL);
571 if (len <= 0)
572 abort();
573
574 dhbuf.data = malloc(len);
575 if (dhbuf.data == NULL)
576 abort();
577 dhbuf.length = len;
578 p = dhbuf.data;
579
580 len = i2o_ECPublicKey(ctx->u.eckey, &p);
581 if (len <= 0)
582 abort();
583
584 /* XXX verify that this is right with RFC3279 */
585 #else
586 return EINVAL;
587 #endif
588 } else
589 krb5_abortx(context, "internal error");
590 a->clientPublicValue->subjectPublicKey.length = dhbuf.length * 8;
591 a->clientPublicValue->subjectPublicKey.data = dhbuf.data;
592 }
593
594 {
595 a->supportedCMSTypes = calloc(1, sizeof(*a->supportedCMSTypes));
596 if (a->supportedCMSTypes == NULL)
597 return ENOMEM;
598
599 ret = hx509_crypto_available(ctx->id->hx509ctx, HX509_SELECT_ALL, NULL,
600 &a->supportedCMSTypes->val,
601 &a->supportedCMSTypes->len);
602 if (ret)
603 return ret;
604 }
605
606 return ret;
607 }
608
609 krb5_error_code KRB5_LIB_FUNCTION
610 _krb5_pk_mk_ContentInfo(krb5_context context,
611 const krb5_data *buf,
612 const heim_oid *oid,
613 struct ContentInfo *content_info)
614 {
615 krb5_error_code ret;
616
617 ret = der_copy_oid(oid, &content_info->contentType);
618 if (ret)
619 return ret;
620 ALLOC(content_info->content, 1);
621 if (content_info->content == NULL)
622 return ENOMEM;
623 content_info->content->data = malloc(buf->length);
624 if (content_info->content->data == NULL)
625 return ENOMEM;
626 memcpy(content_info->content->data, buf->data, buf->length);
627 content_info->content->length = buf->length;
628 return 0;
629 }
630
631 static krb5_error_code
632 pk_mk_padata(krb5_context context,
633 krb5_pk_init_ctx ctx,
634 const KDC_REQ_BODY *req_body,
635 unsigned nonce,
636 METHOD_DATA *md)
637 {
638 struct ContentInfo content_info;
639 krb5_error_code ret;
640 const heim_oid *oid;
641 size_t size;
642 krb5_data buf, sd_buf;
643 int pa_type;
644
645 krb5_data_zero(&buf);
646 krb5_data_zero(&sd_buf);
647 memset(&content_info, 0, sizeof(content_info));
648
649 if (ctx->type == PKINIT_WIN2K) {
650 AuthPack_Win2k ap;
651 krb5_timestamp sec;
652 int32_t usec;
653
654 memset(&ap, 0, sizeof(ap));
655
656 /* fill in PKAuthenticator */
657 ret = copy_PrincipalName(req_body->sname, &ap.pkAuthenticator.kdcName);
658 if (ret) {
659 free_AuthPack_Win2k(&ap);
660 krb5_clear_error_message(context);
661 goto out;
662 }
663 ret = copy_Realm(&req_body->realm, &ap.pkAuthenticator.kdcRealm);
664 if (ret) {
665 free_AuthPack_Win2k(&ap);
666 krb5_clear_error_message(context);
667 goto out;
668 }
669
670 krb5_us_timeofday(context, &sec, &usec);
671 ap.pkAuthenticator.ctime = sec;
672 ap.pkAuthenticator.cusec = usec;
673 ap.pkAuthenticator.nonce = nonce;
674
675 ASN1_MALLOC_ENCODE(AuthPack_Win2k, buf.data, buf.length,
676 &ap, &size, ret);
677 free_AuthPack_Win2k(&ap);
678 if (ret) {
679 krb5_set_error_message(context, ret,
680 N_("Failed encoding AuthPackWin: %d", ""),
681 (int)ret);
682 goto out;
683 }
684 if (buf.length != size)
685 krb5_abortx(context, "internal ASN1 encoder error");
686
687 oid = oid_id_pkcs7_data();
688 } else if (ctx->type == PKINIT_27) {
689 AuthPack ap;
690
691 memset(&ap, 0, sizeof(ap));
692
693 ret = build_auth_pack(context, nonce, ctx, req_body, &ap);
694 if (ret) {
695 free_AuthPack(&ap);
696 goto out;
697 }
698
699 ASN1_MALLOC_ENCODE(AuthPack, buf.data, buf.length, &ap, &size, ret);
700 free_AuthPack(&ap);
701 if (ret) {
702 krb5_set_error_message(context, ret,
703 N_("Failed encoding AuthPack: %d", ""),
704 (int)ret);
705 goto out;
706 }
707 if (buf.length != size)
708 krb5_abortx(context, "internal ASN1 encoder error");
709
710 oid = oid_id_pkauthdata();
711 } else
712 krb5_abortx(context, "internal pkinit error");
713
714 ret = create_signature(context, oid, &buf, ctx->id,
715 ctx->peer, &sd_buf);
716 krb5_data_free(&buf);
717 if (ret)
718 goto out;
719
720 ret = hx509_cms_wrap_ContentInfo(oid_id_pkcs7_signedData(), &sd_buf, &buf);
721 krb5_data_free(&sd_buf);
722 if (ret) {
723 krb5_set_error_message(context, ret,
724 N_("ContentInfo wrapping of signedData failed",""));
725 goto out;
726 }
727
728 if (ctx->type == PKINIT_WIN2K) {
729 PA_PK_AS_REQ_Win2k winreq;
730
731 pa_type = KRB5_PADATA_PK_AS_REQ_WIN;
732
733 memset(&winreq, 0, sizeof(winreq));
734
735 winreq.signed_auth_pack = buf;
736
737 ASN1_MALLOC_ENCODE(PA_PK_AS_REQ_Win2k, buf.data, buf.length,
738 &winreq, &size, ret);
739 free_PA_PK_AS_REQ_Win2k(&winreq);
740
741 } else if (ctx->type == PKINIT_27) {
742 PA_PK_AS_REQ req;
743
744 pa_type = KRB5_PADATA_PK_AS_REQ;
745
746 memset(&req, 0, sizeof(req));
747 req.signedAuthPack = buf;
748
749 if (ctx->trustedCertifiers) {
750
751 req.trustedCertifiers = calloc(1, sizeof(*req.trustedCertifiers));
752 if (req.trustedCertifiers == NULL) {
753 ret = ENOMEM;
754 krb5_set_error_message(context, ret,
755 N_("malloc: out of memory", ""));
756 free_PA_PK_AS_REQ(&req);
757 goto out;
758 }
759 ret = build_edi(context, ctx->id->hx509ctx,
760 ctx->id->anchors, req.trustedCertifiers);
761 if (ret) {
762 krb5_set_error_message(context, ret,
763 N_("pk-init: failed to build "
764 "trustedCertifiers", ""));
765 free_PA_PK_AS_REQ(&req);
766 goto out;
767 }
768 }
769 req.kdcPkId = NULL;
770
771 ASN1_MALLOC_ENCODE(PA_PK_AS_REQ, buf.data, buf.length,
772 &req, &size, ret);
773
774 free_PA_PK_AS_REQ(&req);
775
776 } else
777 krb5_abortx(context, "internal pkinit error");
778 if (ret) {
779 krb5_set_error_message(context, ret, "PA-PK-AS-REQ %d", (int)ret);
780 goto out;
781 }
782 if (buf.length != size)
783 krb5_abortx(context, "Internal ASN1 encoder error");
784
785 ret = krb5_padata_add(context, md, pa_type, buf.data, buf.length);
786 if (ret)
787 free(buf.data);
788
789 if (ret == 0)
790 krb5_padata_add(context, md, KRB5_PADATA_PK_AS_09_BINDING, NULL, 0);
791
792 out:
793 free_ContentInfo(&content_info);
794
795 return ret;
796 }
797
798
799 krb5_error_code KRB5_LIB_FUNCTION
800 _krb5_pk_mk_padata(krb5_context context,
801 void *c,
802 const KDC_REQ_BODY *req_body,
803 unsigned nonce,
804 METHOD_DATA *md)
805 {
806 krb5_pk_init_ctx ctx = c;
807 int win2k_compat;
808
809 win2k_compat = krb5_config_get_bool_default(context, NULL,
810 FALSE,
811 "realms",
812 req_body->realm,
813 "pkinit_win2k",
814 NULL);
815
816 if (win2k_compat) {
817 ctx->require_binding =
818 krb5_config_get_bool_default(context, NULL,
819 FALSE,
820 "realms",
821 req_body->realm,
822 "pkinit_win2k_require_binding",
823 NULL);
824 ctx->type = PKINIT_WIN2K;
825 } else
826 ctx->type = PKINIT_27;
827
828 ctx->require_eku =
829 krb5_config_get_bool_default(context, NULL,
830 TRUE,
831 "realms",
832 req_body->realm,
833 "pkinit_require_eku",
834 NULL);
835 ctx->require_krbtgt_otherName =
836 krb5_config_get_bool_default(context, NULL,
837 TRUE,
838 "realms",
839 req_body->realm,
840 "pkinit_require_krbtgt_otherName",
841 NULL);
842
843 ctx->require_hostname_match =
844 krb5_config_get_bool_default(context, NULL,
845 FALSE,
846 "realms",
847 req_body->realm,
848 "pkinit_require_hostname_match",
849 NULL);
850
851 ctx->trustedCertifiers =
852 krb5_config_get_bool_default(context, NULL,
853 TRUE,
854 "realms",
855 req_body->realm,
856 "pkinit_trustedCertifiers",
857 NULL);
858
859 return pk_mk_padata(context, ctx, req_body, nonce, md);
860 }
861
862 static krb5_error_code
863 pk_verify_sign(krb5_context context,
864 const void *data,
865 size_t length,
866 struct krb5_pk_identity *id,
867 heim_oid *contentType,
868 krb5_data *content,
869 struct krb5_pk_cert **signer)
870 {
871 hx509_certs signer_certs;
872 int ret;
873
874 *signer = NULL;
875
876 ret = hx509_cms_verify_signed(id->hx509ctx,
877 id->verify_ctx,
878 HX509_CMS_VS_ALLOW_DATA_OID_MISMATCH|HX509_CMS_VS_NO_KU_CHECK,
879 data,
880 length,
881 NULL,
882 id->certpool,
883 contentType,
884 content,
885 &signer_certs);
886 if (ret) {
887 pk_copy_error(context, id->hx509ctx, ret,
888 "CMS verify signed failed");
889 return ret;
890 }
891
892 *signer = calloc(1, sizeof(**signer));
893 if (*signer == NULL) {
894 krb5_clear_error_message(context);
895 ret = ENOMEM;
896 goto out;
897 }
898
899 ret = hx509_get_one_cert(id->hx509ctx, signer_certs, &(*signer)->cert);
900 if (ret) {
901 pk_copy_error(context, id->hx509ctx, ret,
902 "Failed to get on of the signer certs");
903 goto out;
904 }
905
906 out:
907 hx509_certs_free(&signer_certs);
908 if (ret) {
909 if (*signer) {
910 hx509_cert_free((*signer)->cert);
911 free(*signer);
912 *signer = NULL;
913 }
914 }
915
916 return ret;
917 }
918
919 static krb5_error_code
920 get_reply_key_win(krb5_context context,
921 const krb5_data *content,
922 unsigned nonce,
923 krb5_keyblock **key)
924 {
925 ReplyKeyPack_Win2k key_pack;
926 krb5_error_code ret;
927 size_t size;
928
929 ret = decode_ReplyKeyPack_Win2k(content->data,
930 content->length,
931 &key_pack,
932 &size);
933 if (ret) {
934 krb5_set_error_message(context, ret,
935 N_("PKINIT decoding reply key failed", ""));
936 free_ReplyKeyPack_Win2k(&key_pack);
937 return ret;
938 }
939
940 if (key_pack.nonce != nonce) {
941 krb5_set_error_message(context, ret,
942 N_("PKINIT enckey nonce is wrong", ""));
943 free_ReplyKeyPack_Win2k(&key_pack);
944 return KRB5KRB_AP_ERR_MODIFIED;
945 }
946
947 *key = malloc (sizeof (**key));
948 if (*key == NULL) {
949 free_ReplyKeyPack_Win2k(&key_pack);
950 krb5_set_error_message(context, ENOMEM,
951 N_("malloc: out of memory", ""));
952 return ENOMEM;
953 }
954
955 ret = copy_EncryptionKey(&key_pack.replyKey, *key);
956 free_ReplyKeyPack_Win2k(&key_pack);
957 if (ret) {
958 krb5_set_error_message(context, ret,
959 N_("PKINIT failed copying reply key", ""));
960 free(*key);
961 *key = NULL;
962 }
963
964 return ret;
965 }
966
967 static krb5_error_code
968 get_reply_key(krb5_context context,
969 const krb5_data *content,
970 const krb5_data *req_buffer,
971 krb5_keyblock **key)
972 {
973 ReplyKeyPack key_pack;
974 krb5_error_code ret;
975 size_t size;
976
977 ret = decode_ReplyKeyPack(content->data,
978 content->length,
979 &key_pack,
980 &size);
981 if (ret) {
982 krb5_set_error_message(context, ret,
983 N_("PKINIT decoding reply key failed", ""));
984 free_ReplyKeyPack(&key_pack);
985 return ret;
986 }
987
988 {
989 krb5_crypto crypto;
990
991 /*
992 * XXX Verify kp.replyKey is a allowed enctype in the
993 * configuration file
994 */
995
996 ret = krb5_crypto_init(context, &key_pack.replyKey, 0, &crypto);
997 if (ret) {
998 free_ReplyKeyPack(&key_pack);
999 return ret;
1000 }
1001
1002 ret = krb5_verify_checksum(context, crypto, 6,
1003 req_buffer->data, req_buffer->length,
1004 &key_pack.asChecksum);
1005 krb5_crypto_destroy(context, crypto);
1006 if (ret) {
1007 free_ReplyKeyPack(&key_pack);
1008 return ret;
1009 }
1010 }
1011
1012 *key = malloc (sizeof (**key));
1013 if (*key == NULL) {
1014 free_ReplyKeyPack(&key_pack);
1015 krb5_set_error_message(context, ENOMEM,
1016 N_("malloc: out of memory", ""));
1017 return ENOMEM;
1018 }
1019
1020 ret = copy_EncryptionKey(&key_pack.replyKey, *key);
1021 free_ReplyKeyPack(&key_pack);
1022 if (ret) {
1023 krb5_set_error_message(context, ret,
1024 N_("PKINIT failed copying reply key", ""));
1025 free(*key);
1026 *key = NULL;
1027 }
1028
1029 return ret;
1030 }
1031
1032
1033 static krb5_error_code
1034 pk_verify_host(krb5_context context,
1035 const char *realm,
1036 const krb5_krbhst_info *hi,
1037 struct krb5_pk_init_ctx_data *ctx,
1038 struct krb5_pk_cert *host)
1039 {
1040 krb5_error_code ret = 0;
1041
1042 if (ctx->require_eku) {
1043 ret = hx509_cert_check_eku(ctx->id->hx509ctx, host->cert,
1044 oid_id_pkkdcekuoid(), 0);
1045 if (ret) {
1046 krb5_set_error_message(context, ret,
1047 N_("No PK-INIT KDC EKU in kdc certificate", ""));
1048 return ret;
1049 }
1050 }
1051 if (ctx->require_krbtgt_otherName) {
1052 hx509_octet_string_list list;
1053 int i;
1054
1055 ret = hx509_cert_find_subjectAltName_otherName(ctx->id->hx509ctx,
1056 host->cert,
1057 oid_id_pkinit_san(),
1058 &list);
1059 if (ret) {
1060 krb5_set_error_message(context, ret,
1061 N_("Failed to find the PK-INIT "
1062 "subjectAltName in the KDC "
1063 "certificate", ""));
1064
1065 return ret;
1066 }
1067
1068 for (i = 0; i < list.len; i++) {
1069 KRB5PrincipalName r;
1070
1071 ret = decode_KRB5PrincipalName(list.val[i].data,
1072 list.val[i].length,
1073 &r,
1074 NULL);
1075 if (ret) {
1076 krb5_set_error_message(context, ret,
1077 N_("Failed to decode the PK-INIT "
1078 "subjectAltName in the "
1079 "KDC certificate", ""));
1080
1081 break;
1082 }
1083
1084 if (r.principalName.name_string.len != 2 ||
1085 strcmp(r.principalName.name_string.val[0], KRB5_TGS_NAME) != 0 ||
1086 strcmp(r.principalName.name_string.val[1], realm) != 0 ||
1087 strcmp(r.realm, realm) != 0)
1088 {
1089 ret = KRB5_KDC_ERR_INVALID_CERTIFICATE;
1090 krb5_set_error_message(context, ret,
1091 N_("KDC have wrong realm name in "
1092 "the certificate", ""));
1093 }
1094
1095 free_KRB5PrincipalName(&r);
1096 if (ret)
1097 break;
1098 }
1099 hx509_free_octet_string_list(&list);
1100 }
1101 if (ret)
1102 return ret;
1103
1104 if (hi) {
1105 ret = hx509_verify_hostname(ctx->id->hx509ctx, host->cert,
1106 ctx->require_hostname_match,
1107 HX509_HN_HOSTNAME,
1108 hi->hostname,
1109 hi->ai->ai_addr, hi->ai->ai_addrlen);
1110
1111 if (ret)
1112 krb5_set_error_message(context, ret,
1113 N_("Address mismatch in "
1114 "the KDC certificate", ""));
1115 }
1116 return ret;
1117 }
1118
1119 static krb5_error_code
1120 pk_rd_pa_reply_enckey(krb5_context context,
1121 int type,
1122 const heim_octet_string *indata,
1123 const heim_oid *dataType,
1124 const char *realm,
1125 krb5_pk_init_ctx ctx,
1126 krb5_enctype etype,
1127 const krb5_krbhst_info *hi,
1128 unsigned nonce,
1129 const krb5_data *req_buffer,
1130 PA_DATA *pa,
1131 krb5_keyblock **key)
1132 {
1133 krb5_error_code ret;
1134 struct krb5_pk_cert *host = NULL;
1135 krb5_data content;
1136 heim_oid contentType = { 0, NULL };
1137 int flags = HX509_CMS_UE_DONT_REQUIRE_KU_ENCIPHERMENT;
1138
1139 if (der_heim_oid_cmp(oid_id_pkcs7_envelopedData(), dataType)) {
1140 krb5_set_error_message(context, EINVAL,
1141 N_("PKINIT: Invalid content type", ""));
1142 return EINVAL;
1143 }
1144
1145 if (ctx->type == PKINIT_WIN2K)
1146 flags |= HX509_CMS_UE_ALLOW_WEAK;
1147
1148 ret = hx509_cms_unenvelope(ctx->id->hx509ctx,
1149 ctx->id->certs,
1150 flags,
1151 indata->data,
1152 indata->length,
1153 NULL,
1154 0,
1155 &contentType,
1156 &content);
1157 if (ret) {
1158 pk_copy_error(context, ctx->id->hx509ctx, ret,
1159 "Failed to unenvelope CMS data in PK-INIT reply");
1160 return ret;
1161 }
1162 der_free_oid(&contentType);
1163
1164 #if 0 /* windows LH with interesting CMS packets, leaks memory */
1165 {
1166 size_t ph = 1 + der_length_len (length);
1167 unsigned char *ptr = malloc(length + ph);
1168 size_t l;
1169
1170 memcpy(ptr + ph, p, length);
1171
1172 ret = der_put_length_and_tag (ptr + ph - 1, ph, length,
1173 ASN1_C_UNIV, CONS, UT_Sequence, &l);
1174 if (ret)
1175 return ret;
1176 ptr += ph - l;
1177 length += l;
1178 p = ptr;
1179 }
1180 #endif
1181
1182 /* win2k uses ContentInfo */
1183 if (type == PKINIT_WIN2K) {
1184 heim_oid type;
1185 heim_octet_string out;
1186
1187 ret = hx509_cms_unwrap_ContentInfo(&content, &type, &out, NULL);
1188 if (ret)
1189 goto out;
1190 if (der_heim_oid_cmp(&type, oid_id_pkcs7_signedData())) {
1191 ret = EINVAL; /* XXX */
1192 krb5_set_error_message(context, ret,
1193 N_("PKINIT: Invalid content type", ""));
1194 der_free_oid(&type);
1195 der_free_octet_string(&out);
1196 goto out;
1197 }
1198 der_free_oid(&type);
1199 krb5_data_free(&content);
1200 ret = krb5_data_copy(&content, out.data, out.length);
1201 der_free_octet_string(&out);
1202 if (ret) {
1203 krb5_set_error_message(context, ret,
1204 N_("malloc: out of memory", ""));
1205 goto out;
1206 }
1207 }
1208
1209 ret = pk_verify_sign(context,
1210 content.data,
1211 content.length,
1212 ctx->id,
1213 &contentType,
1214 &content,
1215 &host);
1216 if (ret)
1217 goto out;
1218
1219 /* make sure that it is the kdc's certificate */
1220 ret = pk_verify_host(context, realm, hi, ctx, host);
1221 if (ret) {
1222 goto out;
1223 }
1224
1225 #if 0
1226 if (type == PKINIT_WIN2K) {
1227 if (der_heim_oid_cmp(&contentType, oid_id_pkcs7_data()) != 0) {
1228 ret = KRB5KRB_AP_ERR_MSG_TYPE;
1229 krb5_set_error_message(context, ret, "PKINIT: reply key, wrong oid");
1230 goto out;
1231 }
1232 } else {
1233 if (der_heim_oid_cmp(&contentType, oid_id_pkrkeydata()) != 0) {
1234 ret = KRB5KRB_AP_ERR_MSG_TYPE;
1235 krb5_set_error_message(context, ret, "PKINIT: reply key, wrong oid");
1236 goto out;
1237 }
1238 }
1239 #endif
1240
1241 switch(type) {
1242 case PKINIT_WIN2K:
1243 ret = get_reply_key(context, &content, req_buffer, key);
1244 if (ret != 0 && ctx->require_binding == 0)
1245 ret = get_reply_key_win(context, &content, nonce, key);
1246 break;
1247 case PKINIT_27:
1248 ret = get_reply_key(context, &content, req_buffer, key);
1249 break;
1250 }
1251 if (ret)
1252 goto out;
1253
1254 /* XXX compare given etype with key->etype */
1255
1256 out:
1257 if (host)
1258 _krb5_pk_cert_free(host);
1259 der_free_oid(&contentType);
1260 krb5_data_free(&content);
1261
1262 return ret;
1263 }
1264
1265 static krb5_error_code
1266 pk_rd_pa_reply_dh(krb5_context context,
1267 const heim_octet_string *indata,
1268 const heim_oid *dataType,
1269 const char *realm,
1270 krb5_pk_init_ctx ctx,
1271 krb5_enctype etype,
1272 const krb5_krbhst_info *hi,
1273 const DHNonce *c_n,
1274 const DHNonce *k_n,
1275 unsigned nonce,
1276 PA_DATA *pa,
1277 krb5_keyblock **key)
1278 {
1279 const unsigned char *p;
1280 unsigned char *dh_gen_key = NULL;
1281 struct krb5_pk_cert *host = NULL;
1282 BIGNUM *kdc_dh_pubkey = NULL;
1283 KDCDHKeyInfo kdc_dh_info;
1284 heim_oid contentType = { 0, NULL };
1285 krb5_data content;
1286 krb5_error_code ret;
1287 int dh_gen_keylen = 0;
1288 size_t size;
1289
1290 krb5_data_zero(&content);
1291 memset(&kdc_dh_info, 0, sizeof(kdc_dh_info));
1292
1293 if (der_heim_oid_cmp(oid_id_pkcs7_signedData(), dataType)) {
1294 krb5_set_error_message(context, EINVAL,
1295 N_("PKINIT: Invalid content type", ""));
1296 return EINVAL;
1297 }
1298
1299 ret = pk_verify_sign(context,
1300 indata->data,
1301 indata->length,
1302 ctx->id,
1303 &contentType,
1304 &content,
1305 &host);
1306 if (ret)
1307 goto out;
1308
1309 /* make sure that it is the kdc's certificate */
1310 ret = pk_verify_host(context, realm, hi, ctx, host);
1311 if (ret)
1312 goto out;
1313
1314 if (der_heim_oid_cmp(&contentType, oid_id_pkdhkeydata())) {
1315 ret = KRB5KRB_AP_ERR_MSG_TYPE;
1316 krb5_set_error_message(context, ret,
1317 N_("pkinit - dh reply contains wrong oid", ""));
1318 goto out;
1319 }
1320
1321 ret = decode_KDCDHKeyInfo(content.data,
1322 content.length,
1323 &kdc_dh_info,
1324 &size);
1325
1326 if (ret) {
1327 krb5_set_error_message(context, ret,
1328 N_("pkinit - failed to decode "
1329 "KDC DH Key Info", ""));
1330 goto out;
1331 }
1332
1333 if (kdc_dh_info.nonce != nonce) {
1334 ret = KRB5KRB_AP_ERR_MODIFIED;
1335 krb5_set_error_message(context, ret,
1336 N_("PKINIT: DH nonce is wrong", ""));
1337 goto out;
1338 }
1339
1340 if (kdc_dh_info.dhKeyExpiration) {
1341 if (k_n == NULL) {
1342 ret = KRB5KRB_ERR_GENERIC;
1343 krb5_set_error_message(context, ret,
1344 N_("pkinit; got key expiration "
1345 "without server nonce", ""));
1346 goto out;
1347 }
1348 if (c_n == NULL) {
1349 ret = KRB5KRB_ERR_GENERIC;
1350 krb5_set_error_message(context, ret,
1351 N_("pkinit; got DH reuse but no "
1352 "client nonce", ""));
1353 goto out;
1354 }
1355 } else {
1356 if (k_n) {
1357 ret = KRB5KRB_ERR_GENERIC;
1358 krb5_set_error_message(context, ret,
1359 N_("pkinit: got server nonce "
1360 "without key expiration", ""));
1361 goto out;
1362 }
1363 c_n = NULL;
1364 }
1365
1366
1367 p = kdc_dh_info.subjectPublicKey.data;
1368 size = (kdc_dh_info.subjectPublicKey.length + 7) / 8;
1369
1370 if (ctx->keyex == USE_DH) {
1371 DHPublicKey k;
1372 ret = decode_DHPublicKey(p, size, &k, NULL);
1373 if (ret) {
1374 krb5_set_error_message(context, ret,
1375 N_("pkinit: can't decode "
1376 "without key expiration", ""));
1377 goto out;
1378 }
1379
1380 kdc_dh_pubkey = integer_to_BN(context, "DHPublicKey", &k);
1381 free_DHPublicKey(&k);
1382 if (kdc_dh_pubkey == NULL) {
1383 ret = ENOMEM;
1384 goto out;
1385 }
1386
1387
1388 dh_gen_keylen = DH_size(ctx->u.dh);
1389 size = BN_num_bytes(ctx->u.dh->p);
1390 if (size < dh_gen_keylen)
1391 size = dh_gen_keylen;
1392
1393 dh_gen_key = malloc(size);
1394 if (dh_gen_key == NULL) {
1395 ret = ENOMEM;
1396 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
1397 goto out;
1398 }
1399 memset(dh_gen_key, 0, size - dh_gen_keylen);
1400
1401 dh_gen_keylen = DH_compute_key(dh_gen_key + (size - dh_gen_keylen),
1402 kdc_dh_pubkey, ctx->u.dh);
1403 if (dh_gen_keylen == -1) {
1404 ret = KRB5KRB_ERR_GENERIC;
1405 krb5_set_error_message(context, ret,
1406 N_("PKINIT: Can't compute Diffie-Hellman key", ""));
1407 goto out;
1408 }
1409 } else {
1410 #ifdef HAVE_OPENSSL
1411 const EC_GROUP *group;
1412 EC_KEY *public = NULL;
1413
1414 group = EC_KEY_get0_group(ctx->u.eckey);
1415
1416 public = EC_KEY_new();
1417 if (public == NULL) {
1418 ret = ENOMEM;
1419 goto out;
1420 }
1421 if (EC_KEY_set_group(public, group) != 1) {
1422 EC_KEY_free(public);
1423 ret = ENOMEM;
1424 goto out;
1425 }
1426
1427 if (o2i_ECPublicKey(&public, &p, size) == NULL) {
1428 EC_KEY_free(public);
1429 ret = KRB5KRB_ERR_GENERIC;
1430 krb5_set_error_message(context, ret,
1431 N_("PKINIT: Can't parse ECDH public key", ""));
1432 goto out;
1433 }
1434
1435 size = (EC_GROUP_get_degree(group) + 7) / 8;
1436 dh_gen_key = malloc(size);
1437 if (dh_gen_key == NULL) {
1438 EC_KEY_free(public);
1439 ret = ENOMEM;
1440 krb5_set_error_message(context, ret,
1441 N_("malloc: out of memory", ""));
1442 goto out;
1443 }
1444 dh_gen_keylen = ECDH_compute_key(dh_gen_key, size,
1445 EC_KEY_get0_public_key(public), ctx->u.eckey, NULL);
1446 EC_KEY_free(public);
1447 if (dh_gen_keylen == -1) {
1448 ret = KRB5KRB_ERR_GENERIC;
1449 krb5_set_error_message(context, ret,
1450 N_("PKINIT: Can't compute ECDH public key", ""));
1451 goto out;
1452 }
1453 #else
1454 ret = EINVAL;
1455 #endif
1456 }
1457
1458 *key = malloc (sizeof (**key));
1459 if (*key == NULL) {
1460 ret = ENOMEM;
1461 krb5_set_error_message(context, ret,
1462 N_("malloc: out of memory", ""));
1463 goto out;
1464 }
1465
1466 ret = _krb5_pk_octetstring2key(context,
1467 etype,
1468 dh_gen_key, dh_gen_keylen,
1469 c_n, k_n,
1470 *key);
1471 if (ret) {
1472 krb5_set_error_message(context, ret,
1473 N_("PKINIT: can't create key from DH key", ""));
1474 free(*key);
1475 *key = NULL;
1476 goto out;
1477 }
1478
1479 out:
1480 if (kdc_dh_pubkey)
1481 BN_free(kdc_dh_pubkey);
1482 if (dh_gen_key) {
1483 memset(dh_gen_key, 0, dh_gen_keylen);
1484 free(dh_gen_key);
1485 }
1486 if (host)
1487 _krb5_pk_cert_free(host);
1488 if (content.data)
1489 krb5_data_free(&content);
1490 der_free_oid(&contentType);
1491 free_KDCDHKeyInfo(&kdc_dh_info);
1492
1493 return ret;
1494 }
1495
1496 krb5_error_code KRB5_LIB_FUNCTION
1497 _krb5_pk_rd_pa_reply(krb5_context context,
1498 const char *realm,
1499 void *c,
1500 krb5_enctype etype,
1501 const krb5_krbhst_info *hi,
1502 unsigned nonce,
1503 const krb5_data *req_buffer,
1504 PA_DATA *pa,
1505 krb5_keyblock **key)
1506 {
1507 krb5_pk_init_ctx ctx = c;
1508 krb5_error_code ret;
1509 size_t size;
1510
1511 /* Check for IETF PK-INIT first */
1512 if (ctx->type == PKINIT_27) {
1513 PA_PK_AS_REP rep;
1514 heim_octet_string os, data;
1515 heim_oid oid;
1516
1517 if (pa->padata_type != KRB5_PADATA_PK_AS_REP) {
1518 krb5_set_error_message(context, EINVAL,
1519 N_("PKINIT: wrong padata recv", ""));
1520 return EINVAL;
1521 }
1522
1523 ret = decode_PA_PK_AS_REP(pa->padata_value.data,
1524 pa->padata_value.length,
1525 &rep,
1526 &size);
1527 if (ret) {
1528 krb5_set_error_message(context, ret,
1529 N_("Failed to decode pkinit AS rep", ""));
1530 return ret;
1531 }
1532
1533 switch (rep.element) {
1534 case choice_PA_PK_AS_REP_dhInfo:
1535 os = rep.u.dhInfo.dhSignedData;
1536 break;
1537 case choice_PA_PK_AS_REP_encKeyPack:
1538 os = rep.u.encKeyPack;
1539 break;
1540 default: {
1541 PA_PK_AS_REP_BTMM btmm;
1542 free_PA_PK_AS_REP(&rep);
1543 memset(&rep, 0, sizeof(rep));
1544
1545 ret = decode_PA_PK_AS_REP_BTMM(pa->padata_value.data,
1546 pa->padata_value.length,
1547 &btmm,
1548 &size);
1549 if (ret) {
1550 krb5_set_error_message(context, EINVAL,
1551 N_("PKINIT: -27 reply "
1552 "invalid content type", ""));
1553 return EINVAL;
1554 }
1555
1556 if (btmm.dhSignedData || btmm.encKeyPack == NULL) {
1557 free_PA_PK_AS_REP_BTMM(&btmm);
1558 ret = EINVAL;
1559 krb5_set_error_message(context, ret,
1560 N_("DH mode not supported for BTMM mode", ""));
1561 return ret;
1562 }
1563
1564 /*
1565 * Transform to IETF style PK-INIT reply so that free works below
1566 */
1567
1568 rep.element = choice_PA_PK_AS_REP_encKeyPack;
1569 rep.u.encKeyPack.data = btmm.encKeyPack->data;
1570 rep.u.encKeyPack.length = btmm.encKeyPack->length;
1571 btmm.encKeyPack->data = NULL;
1572 btmm.encKeyPack->length = 0;
1573 free_PA_PK_AS_REP_BTMM(&btmm);
1574 os = rep.u.encKeyPack;
1575 }
1576 }
1577
1578 ret = hx509_cms_unwrap_ContentInfo(&os, &oid, &data, NULL);
1579 if (ret) {
1580 free_PA_PK_AS_REP(&rep);
1581 krb5_set_error_message(context, ret,
1582 N_("PKINIT: failed to unwrap CI", ""));
1583 return ret;
1584 }
1585
1586 switch (rep.element) {
1587 case choice_PA_PK_AS_REP_dhInfo:
1588 ret = pk_rd_pa_reply_dh(context, &data, &oid, realm, ctx, etype, hi,
1589 ctx->clientDHNonce,
1590 rep.u.dhInfo.serverDHNonce,
1591 nonce, pa, key);
1592 break;
1593 case choice_PA_PK_AS_REP_encKeyPack:
1594 ret = pk_rd_pa_reply_enckey(context, PKINIT_27, &data, &oid, realm,
1595 ctx, etype, hi, nonce, req_buffer, pa, key);
1596 break;
1597 default:
1598 krb5_abortx(context, "pk-init as-rep case not possible to happen");
1599 }
1600 der_free_octet_string(&data);
1601 der_free_oid(&oid);
1602 free_PA_PK_AS_REP(&rep);
1603
1604 } else if (ctx->type == PKINIT_WIN2K) {
1605 PA_PK_AS_REP_Win2k w2krep;
1606
1607 /* Check for Windows encoding of the AS-REP pa data */
1608
1609 #if 0 /* should this be ? */
1610 if (pa->padata_type != KRB5_PADATA_PK_AS_REP) {
1611 krb5_set_error_message(context, EINVAL,
1612 "PKINIT: wrong padata recv");
1613 return EINVAL;
1614 }
1615 #endif
1616
1617 memset(&w2krep, 0, sizeof(w2krep));
1618
1619 ret = decode_PA_PK_AS_REP_Win2k(pa->padata_value.data,
1620 pa->padata_value.length,
1621 &w2krep,
1622 &size);
1623 if (ret) {
1624 krb5_set_error_message(context, ret,
1625 N_("PKINIT: Failed decoding windows "
1626 "pkinit reply %d", ""), (int)ret);
1627 return ret;
1628 }
1629
1630 krb5_clear_error_message(context);
1631
1632 switch (w2krep.element) {
1633 case choice_PA_PK_AS_REP_Win2k_encKeyPack: {
1634 heim_octet_string data;
1635 heim_oid oid;
1636
1637 ret = hx509_cms_unwrap_ContentInfo(&w2krep.u.encKeyPack,
1638 &oid, &data, NULL);
1639 free_PA_PK_AS_REP_Win2k(&w2krep);
1640 if (ret) {
1641 krb5_set_error_message(context, ret,
1642 N_("PKINIT: failed to unwrap CI", ""));
1643 return ret;
1644 }
1645
1646 ret = pk_rd_pa_reply_enckey(context, PKINIT_WIN2K, &data, &oid, realm,
1647 ctx, etype, hi, nonce, req_buffer, pa, key);
1648 der_free_octet_string(&data);
1649 der_free_oid(&oid);
1650
1651 break;
1652 }
1653 default:
1654 free_PA_PK_AS_REP_Win2k(&w2krep);
1655 ret = EINVAL;
1656 krb5_set_error_message(context, ret,
1657 N_("PKINIT: win2k reply invalid "
1658 "content type", ""));
1659 break;
1660 }
1661
1662 } else {
1663 ret = EINVAL;
1664 krb5_set_error_message(context, ret,
1665 N_("PKINIT: unknown reply type", ""));
1666 }
1667
1668 return ret;
1669 }
1670
1671 struct prompter {
1672 krb5_context context;
1673 krb5_prompter_fct prompter;
1674 void *prompter_data;
1675 };
1676
1677 static int
1678 hx_pass_prompter(void *data, const hx509_prompt *prompter)
1679 {
1680 krb5_error_code ret;
1681 krb5_prompt prompt;
1682 krb5_data password_data;
1683 struct prompter *p = data;
1684
1685 password_data.data = prompter->reply.data;
1686 password_data.length = prompter->reply.length;
1687
1688 prompt.prompt = prompter->prompt;
1689 prompt.hidden = hx509_prompt_hidden(prompter->type);
1690 prompt.reply = &password_data;
1691
1692 switch (prompter->type) {
1693 case HX509_PROMPT_TYPE_INFO:
1694 prompt.type = KRB5_PROMPT_TYPE_INFO;
1695 break;
1696 case HX509_PROMPT_TYPE_PASSWORD:
1697 case HX509_PROMPT_TYPE_QUESTION:
1698 default:
1699 prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
1700 break;
1701 }
1702
1703 ret = (*p->prompter)(p->context, p->prompter_data, NULL, NULL, 1, &prompt);
1704 if (ret) {
1705 memset (prompter->reply.data, 0, prompter->reply.length);
1706 return 1;
1707 }
1708 return 0;
1709 }
1710
1711 krb5_error_code KRB5_LIB_FUNCTION
1712 _krb5_pk_load_id(krb5_context context,
1713 struct krb5_pk_identity **ret_id,
1714 int flags,
1715 const char *user_id,
1716 const char *anchor_id,
1717 char * const *chain_list,
1718 char * const *revoke_list,
1719 krb5_prompter_fct prompter,
1720 void *prompter_data,
1721 char *password)
1722 {
1723 struct krb5_pk_identity *id = NULL;
1724 hx509_lock lock = NULL;
1725 struct prompter p;
1726 int ret;
1727
1728 *ret_id = NULL;
1729
1730 if (anchor_id == NULL) {
1731 krb5_set_error_message(context, HEIM_PKINIT_NO_VALID_CA,
1732 N_("PKINIT: No anchor given", ""));
1733 return HEIM_PKINIT_NO_VALID_CA;
1734 }
1735
1736 if (user_id == NULL && (flags & 4) == 0) {
1737 krb5_set_error_message(context, HEIM_PKINIT_NO_PRIVATE_KEY,
1738 N_("PKINIT: No user certificate given", ""));
1739 return HEIM_PKINIT_NO_PRIVATE_KEY;
1740 }
1741
1742 /* load cert */
1743
1744 id = calloc(1, sizeof(*id));
1745 if (id == NULL) {
1746 krb5_set_error_message(context, ENOMEM,
1747 N_("malloc: out of memory", ""));
1748 return ENOMEM;
1749 }
1750
1751 ret = hx509_context_init(&id->hx509ctx);
1752 if (ret)
1753 goto out;
1754
1755 ret = hx509_lock_init(id->hx509ctx, &lock);
1756 if (ret) {
1757 pk_copy_error(context, id->hx509ctx, ret, "Failed init lock");
1758 goto out;
1759 }
1760
1761 if (password && password[0])
1762 hx509_lock_add_password(lock, password);
1763
1764 if (prompter) {
1765 p.context = context;
1766 p.prompter = prompter;
1767 p.prompter_data = prompter_data;
1768
1769 ret = hx509_lock_set_prompter(lock, hx_pass_prompter, &p);
1770 if (ret)
1771 goto out;
1772 }
1773
1774 if (user_id) {
1775 ret = hx509_certs_init(id->hx509ctx, user_id, 0, lock, &id->certs);
1776 if (ret) {
1777 pk_copy_error(context, id->hx509ctx, ret,
1778 "Failed to init cert certs");
1779 goto out;
1780 }
1781 } else {
1782 id->certs = NULL;
1783 }
1784
1785 ret = hx509_certs_init(id->hx509ctx, anchor_id, 0, NULL, &id->anchors);
1786 if (ret) {
1787 pk_copy_error(context, id->hx509ctx, ret,
1788 "Failed to init anchors");
1789 goto out;
1790 }
1791
1792 ret = hx509_certs_init(id->hx509ctx, "MEMORY:pkinit-cert-chain",
1793 0, NULL, &id->certpool);
1794 if (ret) {
1795 pk_copy_error(context, id->hx509ctx, ret,
1796 "Failed to init chain");
1797 goto out;
1798 }
1799
1800 while (chain_list && *chain_list) {
1801 ret = hx509_certs_append(id->hx509ctx, id->certpool,
1802 NULL, *chain_list);
1803 if (ret) {
1804 pk_copy_error(context, id->hx509ctx, ret,
1805 "Failed to laod chain %s",
1806 *chain_list);
1807 goto out;
1808 }
1809 chain_list++;
1810 }
1811
1812 if (revoke_list) {
1813 ret = hx509_revoke_init(id->hx509ctx, &id->revokectx);
1814 if (ret) {
1815 pk_copy_error(context, id->hx509ctx, ret,
1816 "Failed init revoke list");
1817 goto out;
1818 }
1819
1820 while (*revoke_list) {
1821 ret = hx509_revoke_add_crl(id->hx509ctx,
1822 id->revokectx,
1823 *revoke_list);
1824 if (ret) {
1825 pk_copy_error(context, id->hx509ctx, ret,
1826 "Failed load revoke list");
1827 goto out;
1828 }
1829 revoke_list++;
1830 }
1831 } else
1832 hx509_context_set_missing_revoke(id->hx509ctx, 1);
1833
1834 ret = hx509_verify_init_ctx(id->hx509ctx, &id->verify_ctx);
1835 if (ret) {
1836 pk_copy_error(context, id->hx509ctx, ret,
1837 "Failed init verify context");
1838 goto out;
1839 }
1840
1841 hx509_verify_attach_anchors(id->verify_ctx, id->anchors);
1842 hx509_verify_attach_revoke(id->verify_ctx, id->revokectx);
1843
1844 out:
1845 if (ret) {
1846 hx509_verify_destroy_ctx(id->verify_ctx);
1847 hx509_certs_free(&id->certs);
1848 hx509_certs_free(&id->anchors);
1849 hx509_certs_free(&id->certpool);
1850 hx509_revoke_free(&id->revokectx);
1851 hx509_context_free(&id->hx509ctx);
1852 free(id);
1853 } else
1854 *ret_id = id;
1855
1856 if (lock)
1857 hx509_lock_free(lock);
1858
1859 return ret;
1860 }
1861
1862 /*
1863 *
1864 */
1865
1866 static void
1867 pk_copy_error(krb5_context context,
1868 hx509_context hx509ctx,
1869 int hxret,
1870 const char *fmt,
1871 ...)
1872 {
1873 va_list va;
1874 char *s, *f;
1875
1876 va_start(va, fmt);
1877 vasprintf(&f, fmt, va);
1878 va_end(va);
1879 if (f == NULL) {
1880 krb5_clear_error_message(context);
1881 return;
1882 }
1883
1884 s = hx509_get_error_string(hx509ctx, hxret);
1885 if (s == NULL) {
1886 krb5_clear_error_message(context);
1887 free(f);
1888 return;
1889 }
1890 krb5_set_error_message(context, hxret, "%s: %s", f, s);
1891 free(s);
1892 free(f);
1893 }
1894
1895 static int
1896 parse_integer(krb5_context context, char **p, const char *file, int lineno,
1897 const char *name, heim_integer *integer)
1898 {
1899 int ret;
1900 char *p1;
1901 p1 = strsep(p, " \t");
1902 if (p1 == NULL) {
1903 krb5_set_error_message(context, EINVAL,
1904 N_("moduli file %s missing %s on line %d", ""),
1905 file, name, lineno);
1906 return EINVAL;
1907 }
1908 ret = der_parse_hex_heim_integer(p1, integer);
1909 if (ret) {
1910 krb5_set_error_message(context, ret,
1911 N_("moduli file %s failed parsing %s "
1912 "on line %d", ""),
1913 file, name, lineno);
1914 return ret;
1915 }
1916
1917 return 0;
1918 }
1919
1920 krb5_error_code
1921 _krb5_parse_moduli_line(krb5_context context,
1922 const char *file,
1923 int lineno,
1924 char *p,
1925 struct krb5_dh_moduli **m)
1926 {
1927 struct krb5_dh_moduli *m1;
1928 char *p1;
1929 int ret;
1930
1931 *m = NULL;
1932
1933 m1 = calloc(1, sizeof(*m1));
1934 if (m1 == NULL) {
1935 krb5_set_error_message(context, ENOMEM,
1936 N_("malloc: out of memory", ""));
1937 return ENOMEM;
1938 }
1939
1940 while (isspace((unsigned char)*p))
1941 p++;
1942 if (*p == '#') {
1943 free(m1);
1944 return 0;
1945 }
1946 ret = EINVAL;
1947
1948 p1 = strsep(&p, " \t");
1949 if (p1 == NULL) {
1950 krb5_set_error_message(context, ret,
1951 N_("moduli file %s missing name on line %d", ""),
1952 file, lineno);
1953 goto out;
1954 }
1955 m1->name = strdup(p1);
1956 if (m1->name == NULL) {
1957 ret = ENOMEM;
1958 krb5_set_error_message(context, ret, N_("malloc: out of memeory", ""));
1959 goto out;
1960 }
1961
1962 p1 = strsep(&p, " \t");
1963 if (p1 == NULL) {
1964 krb5_set_error_message(context, ret,
1965 N_("moduli file %s missing bits on line %d", ""),
1966 file, lineno);
1967 goto out;
1968 }
1969
1970 m1->bits = atoi(p1);
1971 if (m1->bits == 0) {
1972 krb5_set_error_message(context, ret,
1973 N_("moduli file %s have un-parsable "
1974 "bits on line %d", ""), file, lineno);
1975 goto out;
1976 }
1977
1978 ret = parse_integer(context, &p, file, lineno, "p", &m1->p);
1979 if (ret)
1980 goto out;
1981 ret = parse_integer(context, &p, file, lineno, "g", &m1->g);
1982 if (ret)
1983 goto out;
1984 ret = parse_integer(context, &p, file, lineno, "q", &m1->q);
1985 if (ret)
1986 goto out;
1987
1988 *m = m1;
1989
1990 return 0;
1991 out:
1992 free(m1->name);
1993 der_free_heim_integer(&m1->p);
1994 der_free_heim_integer(&m1->g);
1995 der_free_heim_integer(&m1->q);
1996 free(m1);
1997 return ret;
1998 }
1999
2000 void
2001 _krb5_free_moduli(struct krb5_dh_moduli **moduli)
2002 {
2003 int i;
2004 for (i = 0; moduli[i] != NULL; i++) {
2005 free(moduli[i]->name);
2006 der_free_heim_integer(&moduli[i]->p);
2007 der_free_heim_integer(&moduli[i]->g);
2008 der_free_heim_integer(&moduli[i]->q);
2009 free(moduli[i]);
2010 }
2011 free(moduli);
2012 }
2013
2014 static const char *default_moduli_RFC2412_MODP_group2 =
2015 /* name */
2016 "RFC2412-MODP-group2 "
2017 /* bits */
2018 "1024 "
2019 /* p */
2020 "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1"
2021 "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD"
2022 "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245"
2023 "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED"
2024 "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE65381"
2025 "FFFFFFFF" "FFFFFFFF "
2026 /* g */
2027 "02 "
2028 /* q */
2029 "7FFFFFFF" "FFFFFFFF" "E487ED51" "10B4611A" "62633145" "C06E0E68"
2030 "94812704" "4533E63A" "0105DF53" "1D89CD91" "28A5043C" "C71A026E"
2031 "F7CA8CD9" "E69D218D" "98158536" "F92F8A1B" "A7F09AB6" "B6A8E122"
2032 "F242DABB" "312F3F63" "7A262174" "D31BF6B5" "85FFAE5B" "7A035BF6"
2033 "F71C35FD" "AD44CFD2" "D74F9208" "BE258FF3" "24943328" "F67329C0"
2034 "FFFFFFFF" "FFFFFFFF";
2035
2036 static const char *default_moduli_rfc3526_MODP_group14 =
2037 /* name */
2038 "rfc3526-MODP-group14 "
2039 /* bits */
2040 "1760 "
2041 /* p */
2042 "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1"
2043 "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD"
2044 "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245"
2045 "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED"
2046 "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE45B3D"
2047 "C2007CB8" "A163BF05" "98DA4836" "1C55D39A" "69163FA8" "FD24CF5F"
2048 "83655D23" "DCA3AD96" "1C62F356" "208552BB" "9ED52907" "7096966D"
2049 "670C354E" "4ABC9804" "F1746C08" "CA18217C" "32905E46" "2E36CE3B"
2050 "E39E772C" "180E8603" "9B2783A2" "EC07A28F" "B5C55DF0" "6F4C52C9"
2051 "DE2BCBF6" "95581718" "3995497C" "EA956AE5" "15D22618" "98FA0510"
2052 "15728E5A" "8AACAA68" "FFFFFFFF" "FFFFFFFF "
2053 /* g */
2054 "02 "
2055 /* q */
2056 "7FFFFFFF" "FFFFFFFF" "E487ED51" "10B4611A" "62633145" "C06E0E68"
2057 "94812704" "4533E63A" "0105DF53" "1D89CD91" "28A5043C" "C71A026E"
2058 "F7CA8CD9" "E69D218D" "98158536" "F92F8A1B" "A7F09AB6" "B6A8E122"
2059 "F242DABB" "312F3F63" "7A262174" "D31BF6B5" "85FFAE5B" "7A035BF6"
2060 "F71C35FD" "AD44CFD2" "D74F9208" "BE258FF3" "24943328" "F6722D9E"
2061 "E1003E5C" "50B1DF82" "CC6D241B" "0E2AE9CD" "348B1FD4" "7E9267AF"
2062 "C1B2AE91" "EE51D6CB" "0E3179AB" "1042A95D" "CF6A9483" "B84B4B36"
2063 "B3861AA7" "255E4C02" "78BA3604" "650C10BE" "19482F23" "171B671D"
2064 "F1CF3B96" "0C074301" "CD93C1D1" "7603D147" "DAE2AEF8" "37A62964"
2065 "EF15E5FB" "4AAC0B8C" "1CCAA4BE" "754AB572" "8AE9130C" "4C7D0288"
2066 "0AB9472D" "45565534" "7FFFFFFF" "FFFFFFFF";
2067
2068 krb5_error_code
2069 _krb5_parse_moduli(krb5_context context, const char *file,
2070 struct krb5_dh_moduli ***moduli)
2071 {
2072 /* name bits P G Q */
2073 krb5_error_code ret;
2074 struct krb5_dh_moduli **m = NULL, **m2;
2075 char buf[4096];
2076 FILE *f;
2077 int lineno = 0, n = 0;
2078
2079 *moduli = NULL;
2080
2081 m = calloc(1, sizeof(m[0]) * 3);
2082 if (m == NULL) {
2083 krb5_set_error_message(context, ENOMEM,
2084 N_("malloc: out of memory", ""));
2085 return ENOMEM;
2086 }
2087
2088 strlcpy(buf, default_moduli_rfc3526_MODP_group14, sizeof(buf));
2089 ret = _krb5_parse_moduli_line(context, "builtin", 1, buf, &m[0]);
2090 if (ret) {
2091 _krb5_free_moduli(m);
2092 return ret;
2093 }
2094 n++;
2095
2096 strlcpy(buf, default_moduli_RFC2412_MODP_group2, sizeof(buf));
2097 ret = _krb5_parse_moduli_line(context, "builtin", 1, buf, &m[1]);
2098 if (ret) {
2099 _krb5_free_moduli(m);
2100 return ret;
2101 }
2102 n++;
2103
2104
2105 if (file == NULL)
2106 file = MODULI_FILE;
2107
2108 f = fopen(file, "r");
2109 if (f == NULL) {
2110 *moduli = m;
2111 return 0;
2112 }
2113 rk_cloexec_file(f);
2114
2115 while(fgets(buf, sizeof(buf), f) != NULL) {
2116 struct krb5_dh_moduli *element;
2117
2118 buf[strcspn(buf, "\n")] = '\0';
2119 lineno++;
2120
2121 m2 = realloc(m, (n + 2) * sizeof(m[0]));
2122 if (m2 == NULL) {
2123 _krb5_free_moduli(m);
2124 krb5_set_error_message(context, ENOMEM,
2125 N_("malloc: out of memory", ""));
2126 return ENOMEM;
2127 }
2128 m = m2;
2129
2130 m[n] = NULL;
2131
2132 ret = _krb5_parse_moduli_line(context, file, lineno, buf, &element);
2133 if (ret) {
2134 _krb5_free_moduli(m);
2135 return ret;
2136 }
2137 if (element == NULL)
2138 continue;
2139
2140 m[n] = element;
2141 m[n + 1] = NULL;
2142 n++;
2143 }
2144 *moduli = m;
2145 return 0;
2146 }
2147
2148 krb5_error_code
2149 _krb5_dh_group_ok(krb5_context context, unsigned long bits,
2150 heim_integer *p, heim_integer *g, heim_integer *q,
2151 struct krb5_dh_moduli **moduli,
2152 char **name)
2153 {
2154 int i;
2155
2156 if (name)
2157 *name = NULL;
2158
2159 for (i = 0; moduli[i] != NULL; i++) {
2160 if (der_heim_integer_cmp(&moduli[i]->g, g) == 0 &&
2161 der_heim_integer_cmp(&moduli[i]->p, p) == 0 &&
2162 (q == NULL || der_heim_integer_cmp(&moduli[i]->q, q) == 0))
2163 {
2164 if (bits && bits > moduli[i]->bits) {
2165 krb5_set_error_message(context,
2166 KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED,
2167 N_("PKINIT: DH group parameter %s "
2168 "no accepted, not enough bits "
2169 "generated", ""),
2170 moduli[i]->name);
2171 return KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED;
2172 }
2173 if (name)
2174 *name = strdup(moduli[i]->name);
2175 return 0;
2176 }
2177 }
2178 krb5_set_error_message(context,
2179 KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED,
2180 N_("PKINIT: DH group parameter no ok", ""));
2181 return KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED;
2182 }
2183 #endif /* PKINIT */
2184
2185 void KRB5_LIB_FUNCTION
2186 _krb5_get_init_creds_opt_free_pkinit(krb5_get_init_creds_opt *opt)
2187 {
2188 #ifdef PKINIT
2189 krb5_pk_init_ctx ctx;
2190
2191 if (opt->opt_private == NULL || opt->opt_private->pk_init_ctx == NULL)
2192 return;
2193 ctx = opt->opt_private->pk_init_ctx;
2194 switch (ctx->keyex) {
2195 case USE_DH:
2196 DH_free(ctx->u.dh);
2197 break;
2198 case USE_RSA:
2199 break;
2200 case USE_ECDH:
2201 #ifdef HAVE_OPENSSL
2202 EC_KEY_free(ctx->u.eckey);
2203 #endif
2204 break;
2205 }
2206 if (ctx->id) {
2207 hx509_verify_destroy_ctx(ctx->id->verify_ctx);
2208 hx509_certs_free(&ctx->id->certs);
2209 hx509_cert_free(ctx->id->cert);
2210 hx509_certs_free(&ctx->id->anchors);
2211 hx509_certs_free(&ctx->id->certpool);
2212 hx509_context_free(&ctx->id->hx509ctx);
2213
2214 if (ctx->clientDHNonce) {
2215 krb5_free_data(NULL, ctx->clientDHNonce);
2216 ctx->clientDHNonce = NULL;
2217 }
2218 if (ctx->m)
2219 _krb5_free_moduli(ctx->m);
2220 free(ctx->id);
2221 ctx->id = NULL;
2222 }
2223 free(opt->opt_private->pk_init_ctx);
2224 opt->opt_private->pk_init_ctx = NULL;
2225 #endif
2226 }
2227
2228 krb5_error_code KRB5_LIB_FUNCTION
2229 krb5_get_init_creds_opt_set_pkinit(krb5_context context,
2230 krb5_get_init_creds_opt *opt,
2231 krb5_principal principal,
2232 const char *user_id,
2233 const char *x509_anchors,
2234 char * const * pool,
2235 char * const * pki_revoke,
2236 int flags,
2237 krb5_prompter_fct prompter,
2238 void *prompter_data,
2239 char *password)
2240 {
2241 #ifdef PKINIT
2242 krb5_error_code ret;
2243 char *anchors = NULL;
2244
2245 if (opt->opt_private == NULL) {
2246 krb5_set_error_message(context, EINVAL,
2247 N_("PKINIT: on non extendable opt", ""));
2248 return EINVAL;
2249 }
2250
2251 opt->opt_private->pk_init_ctx =
2252 calloc(1, sizeof(*opt->opt_private->pk_init_ctx));
2253 if (opt->opt_private->pk_init_ctx == NULL) {
2254 krb5_set_error_message(context, ENOMEM,
2255 N_("malloc: out of memory", ""));
2256 return ENOMEM;
2257 }
2258 opt->opt_private->pk_init_ctx->require_binding = 0;
2259 opt->opt_private->pk_init_ctx->require_eku = 1;
2260 opt->opt_private->pk_init_ctx->require_krbtgt_otherName = 1;
2261 opt->opt_private->pk_init_ctx->peer = NULL;
2262
2263 /* XXX implement krb5_appdefault_strings */
2264 if (pool == NULL)
2265 pool = krb5_config_get_strings(context, NULL,
2266 "appdefaults",
2267 "pkinit_pool",
2268 NULL);
2269
2270 if (pki_revoke == NULL)
2271 pki_revoke = krb5_config_get_strings(context, NULL,
2272 "appdefaults",
2273 "pkinit_revoke",
2274 NULL);
2275
2276 if (x509_anchors == NULL) {
2277 krb5_appdefault_string(context, "kinit",
2278 krb5_principal_get_realm(context, principal),
2279 "pkinit_anchors", NULL, &anchors);
2280 x509_anchors = anchors;
2281 }
2282
2283 ret = _krb5_pk_load_id(context,
2284 &opt->opt_private->pk_init_ctx->id,
2285 flags,
2286 user_id,
2287 x509_anchors,
2288 pool,
2289 pki_revoke,
2290 prompter,
2291 prompter_data,
2292 password);
2293 if (ret) {
2294 free(opt->opt_private->pk_init_ctx);
2295 opt->opt_private->pk_init_ctx = NULL;
2296 return ret;
2297 }
2298
2299 if (opt->opt_private->pk_init_ctx->id->certs) {
2300 hx509_query *q = NULL;
2301 hx509_cert cert = NULL;
2302 hx509_context hx509ctx = opt->opt_private->pk_init_ctx->id->hx509ctx;
2303
2304 ret = hx509_query_alloc(hx509ctx, &q);
2305 if (ret) {
2306 pk_copy_error(context, hx509ctx, ret,
2307 "Allocate query to find signing certificate");
2308 return ret;
2309 }
2310
2311 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
2312 hx509_query_match_option(q, HX509_QUERY_OPTION_KU_DIGITALSIGNATURE);
2313
2314 ret = find_cert(context, opt->opt_private->pk_init_ctx->id, q, &cert);
2315 hx509_query_free(hx509ctx, q);
2316 if (ret)
2317 return ret;
2318
2319 opt->opt_private->pk_init_ctx->id->cert = cert;
2320 } else
2321 opt->opt_private->pk_init_ctx->id->cert = NULL;
2322
2323 if ((flags & 2) == 0) {
2324 hx509_context hx509ctx = opt->opt_private->pk_init_ctx->id->hx509ctx;
2325 hx509_cert cert = opt->opt_private->pk_init_ctx->id->cert;
2326
2327 opt->opt_private->pk_init_ctx->keyex = USE_DH;
2328
2329 /*
2330 * If its a ECDSA certs, lets select ECDSA as the keyex algorithm.
2331 */
2332 if (cert) {
2333 AlgorithmIdentifier alg;
2334
2335 ret = hx509_cert_get_SPKI_AlgorithmIdentifier(hx509ctx, cert, &alg);
2336 if (ret == 0) {
2337 if (der_heim_oid_cmp(&alg.algorithm, &asn1_oid_id_ecPublicKey) == 0)
2338 opt->opt_private->pk_init_ctx->keyex = USE_ECDH;
2339 free_AlgorithmIdentifier(&alg);
2340 }
2341 }
2342
2343 } else {
2344 opt->opt_private->pk_init_ctx->keyex = USE_RSA;
2345
2346 if (opt->opt_private->pk_init_ctx->id->certs == NULL) {
2347 krb5_set_error_message(context, EINVAL,
2348 N_("No anonymous pkinit support in RSA mode", ""));
2349 return EINVAL;
2350 }
2351 }
2352
2353 return 0;
2354 #else
2355 krb5_set_error_message(context, EINVAL,
2356 N_("no support for PKINIT compiled in", ""));
2357 return EINVAL;
2358 #endif
2359 }
2360
2361 #ifdef PKINIT
2362
2363 static int
2364 get_ms_san(hx509_context context, hx509_cert cert, char **upn)
2365 {
2366 hx509_octet_string_list list;
2367 int ret;
2368
2369 *upn = NULL;
2370
2371 ret = hx509_cert_find_subjectAltName_otherName(context,
2372 cert,
2373 oid_id_pkinit_ms_san(),
2374 &list);
2375 if (ret)
2376 return 0;
2377
2378 if (list.len > 0 && list.val[0].length > 0)
2379 ret = decode_MS_UPN_SAN(list.val[0].data, list.val[0].length,
2380 upn, NULL);
2381 else
2382 ret = 1;
2383 hx509_free_octet_string_list(&list);
2384
2385 return ret;
2386 }
2387
2388 static int
2389 find_ms_san(hx509_context context, hx509_cert cert, void *ctx)
2390 {
2391 char *upn;
2392 int ret;
2393
2394 ret = get_ms_san(context, cert, &upn);
2395 if (ret == 0)
2396 free(upn);
2397 return ret;
2398 }
2399
2400
2401
2402 #endif
2403
2404 /*
2405 * Private since it need to be redesigned using krb5_get_init_creds()
2406 */
2407
2408 krb5_error_code KRB5_LIB_FUNCTION
2409 _krb5_pk_enterprise_cert(krb5_context context,
2410 const char *user_id,
2411 krb5_const_realm realm,
2412 krb5_principal *principal)
2413 {
2414 #ifdef PKINIT
2415 krb5_error_code ret;
2416 hx509_context hx509ctx;
2417 hx509_certs certs, result;
2418 hx509_cert cert;
2419 hx509_query *q;
2420 char *name;
2421
2422 *principal = NULL;
2423
2424 if (user_id == NULL)
2425 return ENOENT;
2426
2427 ret = hx509_context_init(&hx509ctx);
2428 if (ret)
2429 return ret;
2430
2431 ret = hx509_certs_init(hx509ctx, user_id, 0, NULL, &certs);
2432 if (ret) {
2433 pk_copy_error(context, hx509ctx, ret,
2434 "Failed to init cert certs");
2435 return ret;
2436 }
2437
2438 ret = hx509_query_alloc(hx509ctx, &q);
2439 if (ret) {
2440 hx509_certs_free(&certs);
2441 return ret;
2442 }
2443
2444 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
2445 hx509_query_match_option(q, HX509_QUERY_OPTION_KU_DIGITALSIGNATURE);
2446 hx509_query_match_eku(q, oid_id_pkinit_ms_eku());
2447 hx509_query_match_cmp_func(q, find_ms_san, NULL);
2448
2449 ret = hx509_certs_filter(hx509ctx, certs, q, &result);
2450 hx509_query_free(hx509ctx, q);
2451 hx509_certs_free(&certs);
2452 if (ret)
2453 return ret;
2454
2455 ret = hx509_get_one_cert(hx509ctx, result, &cert);
2456 hx509_certs_free(&result);
2457 if (ret)
2458 return ret;
2459
2460 ret = get_ms_san(hx509ctx, cert, &name);
2461 if (ret)
2462 return ret;
2463
2464 ret = krb5_make_principal(context, principal, realm, name, NULL);
2465 free(name);
2466 hx509_context_free(&hx509ctx);
2467 if (ret)
2468 return ret;
2469
2470 krb5_principal_set_type(context, *principal, KRB5_NT_ENTERPRISE_PRINCIPAL);
2471
2472 return ret;
2473 #else
2474 krb5_set_error_message(context, EINVAL,
2475 N_("no support for PKINIT compiled in", ""));
2476 return EINVAL;
2477 #endif
2478 }
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